PXE HTTP

At MeetBSD California 2010 (#meetbsdca), one of the break out sessions "finishing" and merging the mini-tcp stack and HTTP loader support in pxeboot gain enough interest. The idea would be to get this eventually into base.

The code as-is, does work with an old version os 6(?)-stable. However BTX and the loader changed enough since then, that some updating will be needed to get this into 8-stable and -head.